CWE-178

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            "url": "https://github.com/elixir-tesla/tesla/security/advisories/GHSA-9m9w-gxf7-rh8m"
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        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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          "type": "analyst",
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              "value": "Improper Handling of Case Sensitivity vulnerability in elixir-tesla tesla allows credential leakage to a third-party origin on cross-origin redirects.\n\n`Tesla.Middleware.FollowRedirects` strips security-sensitive headers on cross-origin redirects using a case-sensitive string comparison against a lowercase filter list (`@filter_headers [\"authorization\", \"host\"]`). HTTP header names are case-insensitive per RFC 7230, but Tesla preserves header keys verbatim as supplied by the caller without normalizing case. A header set as `{\"Authorization\", \"Bearer \u2026\"}` (the RFC 7235 canonical casing used by virtually all HTTP libraries and documentation) does not match the lowercase filter entry and is forwarded to the redirect destination. An attacker who can control or influence a `Location:` response seen by the client (via their own endpoint, a redirect-open upstream, or a compromised origin) receives the bearer token or other `Authorization` material on the cross-origin request.\n\nThis issue affects tesla: from 1.4.0 before 1.18.3."
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      "providerMetadata": {
        "dateUpdated": "2026-09-24T20:51:36.899Z",
        "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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        {
          "name": "Introducing commit 2d937d5 in elixir-tesla/tesla",
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      "title": "Authorization header leaks to third-party origin on cross-origin redirect in Tesla.Middleware.FollowRedirects",
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